iOS UISplitViewController Interacting Between Master and Detail View using Delegates in Objective C

Example

UISplitViewController needs to the root view controller of your app’s window

AppDelegate.m

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] self.window.backgroundColor = [UIColor blackColor]; [self.window makeKeyAndVisible]; self.window.clipsToBounds = YES; SplitViewController *spView = [[SplitViewController alloc]init]; self.window.rootViewController = spView; [self.window makeKeyAndVisible]; return YES; } 

Just create an object for your UISplitVIewController and set it as the rootViewController for your application.

SplitViewController.h

#import <UIKit/UIKit.h> #import "MasterViewController.h" #import "DetailViewController.h" @interface ViewController : UISplitViewController { DetailViewController *detailVC; MasterViewController *masterVC; NSMutableArray *array; } @end 

MasterViewController is a UIViewController that is set on the left side of the device you can set the width in UISplitViewController using maximumPrimaryColumnWidth and DetailViewController is on the Right side

SplitViewController.m

#import "ViewController.h" #define ANIMATION_LENGTH 0.3 @interface ViewController () @end @implementation ViewController - (void)viewDidLoad { [super viewDidLoad]; masterVC = [[MasterViewController alloc]init]; detailVC = [[DetailViewController alloc]init]; [masterVC setDetailDelegate:(id)detailVC]; NSArray *vcArray = [NSArray arrayWithObjects:masterVC, detailVC, nil]; self.preferredDisplayMode = UISplitViewControllerDisplayModeAutomatic; self.viewControllers = vcArray; self.delegate = (id)self; self.presentsWithGesture = YES; } 

The master and detail UIViewController's are added to an NSArray which is set to self.viewControllers. self.preferredDisplayMode is is the mode set for displaying of MasterViewController and DetailViewController . self.presentsWithGesture enables swipe gesture for displaying MasterViewController

MasterViewController.h

#import <UIKit/UIKit.h> @protocol DetailViewDelegate <NSObject> @required - (void)sendSelectedNavController:(UIViewController *)viewController; @end @interface MasterViewController : UIViewController { UITableView *mainTableView; NSMutableArray *viewControllerArray; } @property (nonatomic, retain) id<DetailViewDelegate> detailDelegate; @end 

Create a DetailViewDelegate Delegate with sendSelectedNavController method for sending the UIViewControllers to the DetailViewController. Then in MasterViewController an UITableViewis created . The ViewControllerArray contains all the UIViewControllers that needs to be displayed in DetailViewController

MasterViewController.m

#import "MasterViewController.h" @implementation MasterViewController @synthesize detailDelegate; -(void)viewDidLoad { [super viewDidLoad]; UIViewController *dashBoardVC = [[UIViewController alloc]init]; [dashBoardVC.view setBackgroundColor:[UIColor redColor]]; UIViewController *inventVC = [[UIViewController alloc]init]; [inventVC.view setBackgroundColor:[UIColor whiteColor]]; UIViewController *alarmVC = [[UIViewController alloc]init]; [alarmVC.view setBackgroundColor: [UIColor purpleColor]]; UIViewController *scanDeviceVC = [[UIViewController alloc]init]; [scanDeviceVC.view setBackgroundColor:[UIColor cyanColor]]; UIViewController *serverDetailVC = [[UIViewController alloc]init]; [serverDetailVC.view setBackgroundColor: [UIColor whiteColor]]; viewControllerArray = [[NSMutableArray alloc]initWithObjects:dashBoardVC,inventVC,alarmVC,scanDeviceVC,serverDetailVC,nil]; mainTableView = [[UITableView alloc]initWithFrame:CGRectMake(0, 50,self.view.frame.size.width, self.view.frame.size.height-50) style:UITableViewStylePlain]; [mainTableView setDelegate:(id)self]; [mainTableView setDataSource:(id)self]; [mainTableView setSeparatorStyle:UITableViewCellSeparatorStyleNone]; [mainTableView setScrollsToTop:NO]; [self.view addSubview:mainTableView]; } - (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath { return 100; } - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection: (NSInteger)section { return [viewControllerArray count]; } - (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView { return 1; //count of section } - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { NSString *cellId = [NSString stringWithFormat:@"Cell%li%ld",(long)indexPath.section,(long)indexPath.row]; UITableViewCell *cell =[tableView dequeueReusableCellWithIdentifier:cellId]; if (cell == nil) { cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellId]; } [cell.contentView setBackgroundColor:[UIColor redColor]]; cell.textLabel.text =[NSString stringWithFormat:@"My VC at index %ld",(long)indexPath.row]; return cell; } - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath { [detailDelegate sendSelectedNavController:[viewControllerArray objectAtIndex:indexPath.row]]; } @end 

Created some UIViewController and added it to an NSMutableArray. The UITableView is initialized then on didselectrowatindexpath method I send a UIViewController to the DetailViewController using detailDelegate delegate with the corresponding UIViewController in the NSMutableArray as a parameter

DetailViewController.h

#import <UIKit/UIKit.h> @interface DetailViewController : UIViewController<UICollectionViewDelegate> { UIViewController *tempNav; } @end 

DetailViewController.m

#import "DetailViewController.h" @implementation DetailViewController -(void)viewDidLoad { [super viewDidLoad]; [self.view setBackgroundColor:[UIColor whiteColor]]; } -(void)sendSelectedNavController:(UIViewController *)navController { NSArray *viewsToRemove = [self.view subviews]; for (UIView *v in viewsToRemove) { [v removeFromSuperview]; } tempNav = navController; [self.view addSubview:tempNav.view]; } @end 

The sendSelectedNavController is declared here with removing all the UIView's in the DetailViewController and adding the passed UIViewController from the MasterViewController.

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